Richard Scheffenegger 231e0dd5d1 tcp: skip sackhole checks on NULL
Inadvertedly introduced NULL pointer dereference during
sackhole sanity check in D35387.

Reviewed By:	glebius
PR:		263445
MFC after:	1 week
Sponsored by:	NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D35423
2022-06-07 18:18:42 +02:00
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